Answer the following questions about the SWEETTEA peptide. Part A: How many peptide bonds are in this peptide? 7 Part B: What is the three letter code for the N-terminal amino acid? ser Part C: What is the three letter code for the C-terminal amino acid?

Part A: How many peptide bonds are in this peptide?

Part B: What is the three letter code for the N-terminal amino acid?

Part C: What is the three letter code for the C-terminal amino acid?

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Deanna HettingerLv2

13 Oct 2018

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a hemoglobin with an abnormal electrophoretic mobility is detected in a screening program. Fingerprinting after the tryptic digestion reveals that the amino acid substitution is in the b chain. The normal amino-terminal (digested with trypsin) peptide (Val-His-Leu-Thr-Pro-Glu-Glu-Lys) is missing. A new tryptic peptide consisting of six amino acid terminal residue of this peptide.

a. Which amino acid substitutions are consistent with these data?

b. Which single base changes in DNA sequence could give these amino acid substitutions? The DNA sequence encoding the normal amino terminal region is GTGCACCTGACTCCTGAGGAGAAG.

c. How should the electrophoretic mobility of the abnormal hemoglobin compare with those of Hb A at pH 8 (would it move quicker or slower to the anode)?

apricotraven905

A small amount of a rare protein has been isolated and treated with proteases to cleave the protein into peptide fragments, which were separated by chromatography and subjected to mass spectrometry to determine their amino acid sequence. Unfortunately, as is often the case when only small amounts of protein are available, only the following three short stretches of amino acid sequence from the protein were obtained:

Peptide #1: Ala-Gln-His-Leu-Met-Lys Peptide

#2: Arg-Arg-Asn-Ile-Val-Ala Peptide

#3: Val-Asn-Ser-Thr-Ala-Pro A.

Using the genetic code (see Figure 7.24), design a collection of DNA probes specific for each peptide that could be used to detect the gene in a cDNA library by hybridization. (2 points) B. Which of the three collections of oligonucleotide probes would be preferable to use first. Explain your answer. (Hint, since the genetic code is redundant, each peptide has multiple potential coding sequences).

Amino Acids.

Question 1, Part A.
Which amino acid will be the most soluble in water? Explain why.
A. Leucine
B. Proline
C. Lysine
D. Glutamate

Question 1, Part B.
During hydrolysis of an amino acid chain, what bonds are broken?
A. Disulfide bonds
B. Phosphodiester bonds
C. Ionic bonds
D. Peptide bonds

Question 1, Part C.
What factors allow a pool of 20 amino acids to produce thousands of unique proteins? Select all that apply.
A. Variation in length of amino acid backbone
B. Each protein is encoded by a distinct gene
C. Variations in the type of peptide bond
D. Variations in the glycosidic linkage
E. Variation in tertiary structure
F. Variations in which amino acids are used